1. 生產PEX管的(de)(de)主要原(yuan)料(liao)(liao)是HDPE以(yi)及引發(fa)劑、交(jiao)聯(lian)劑、催化(hua)劑等(deng)助劑，如有特殊要求還(huan)可以(yi)添加其(qi)(qi)(qi)他(ta)改(gai)質劑。PEX管采用(yong)世界上先進的(de)(de)一步法（MONSOIL法）技術(shu)制造(zao)，采用(yong)普(pu)通聚(ju)乙烯原(yuan)料(liao)(liao)加入硅烷(wan)接枝料(liao)(liao)，在聚(ju)合(he)物大分(fen)子(zi)鏈間(jian)形成化(hua)學共價鍵以(yi)取(qu)代原(yuan)有的(de)(de)范德華力，從而形成三維交(jiao)鏈網狀結(jie)(jie)構的(de)(de)交(jiao)聯(lian)聚(ju)乙烯，其(qi)(qi)(qi)交(jiao)聯(lian)度可達(da)60％～89％，使其(qi)(qi)(qi)具有優良的(de)(de)理化(hua)性能。PEX 管交(jiao)聯(lian)劑（添加劑）是對其(qi)(qi)(qi)原(yuan)線型分(fen)子(zi)結(jie)(jie)構起(qi)裂解作(zuo)用(yong)形成接枝料(liao)(liao)，進而形成三維網狀結(jie)(jie)構。抗氧劑及色粒的(de)(de)作(zuo)用(yong)是提高PEX管的(de)(de)耐腐(fu)性，防止日(ri)光長(chang)期照射(she)發(fa)生物性變化(hua)，能夠抵御紫外線的(de)(de)長(chang)期侵蝕，從而延長(chang)其(qi)(qi)(qi)使用(yong)壽(shou)命。
2. PEX管(guan)的性(xing)能(neng)和特點。
①. PEX管與鍍鋅鋼管的性(xing)能比較見(jian)表4.3.14。
②. PEX管(guan)(guan)(guan)(guan)與UPVC管(guan)(guan)(guan)(guan)、鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)性(xing)(xing)能(neng)(neng)(neng)異同點。從性(xing)(xing)能(neng)(neng)(neng)上看，三種管(guan)(guan)(guan)(guan)材(cai)除具有(you)不(bu)銹蝕、不(bu)結垢(gou)(gou)、不(bu)滋生(sheng)細菌和(he)(he)安裝簡便(bian)等(deng)共性(xing)(xing)外，還有(you)一些(xie)區別：a.優(you)良的(de)(de)(de)耐溫(wen)性(xing)(xing)能(neng)(neng)(neng)。PEX管(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)溫(wen)度(du)(du)為(wei)(wei)-70～110℃，UPVC管(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)溫(wen)度(du)(du)為(wei)(wei)5～45℃，鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)溫(wen)度(du)(du)為(wei)(wei)-40～85℃。b．防(fang)振性(xing)(xing)能(neng)(neng)(neng)。UPVC管(guan)(guan)(guan)(guan)由(you)于(yu)(yu)采用(yong)(yong)膠水粘(zhan)接，防(fang)振性(xing)(xing)能(neng)(neng)(neng)略遜色于(yu)(yu)鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)和(he)(he)PEX管(guan)(guan)(guan)(guan)。c．使(shi)(shi)用(yong)(yong)壽命。UPVC管(guan)(guan)(guan)(guan)和(he)(he)鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)使(shi)(shi)用(yong)(yong)壽命約20～30年(nian)，PEX管(guan)(guan)(guan)(guan)約50年(nian)。d．抗(kang)化學(xue)腐蝕性(xing)(xing)能(neng)(neng)(neng)。由(you)于(yu)(yu)PEX管(guan)(guan)(guan)(guan)其(qi)分子結構，即使(shi)(shi)處于(yu)(yu)高溫(wen)下也(ye)能(neng)(neng)(neng)輸送(song)多種化學(xue)物(wu)(wu)質，而不(bu)被腐蝕。e．良好(hao)的(de)(de)(de)記憶性(xing)(xing)能(neng)(neng)(neng)。當PEX管(guan)(guan)(guan)(guan)被加(jia)熱到(dao)適當溫(wen)度(du)(du)（小于(yu)(yu)180℃）時(shi)會(hui)(hui)變(bian)成(cheng)透明狀(zhuang)，再(zai)冷卻時(shi)會(hui)(hui)恢(hui)復(fu)到(dao)原來的(de)(de)(de)形(xing)狀(zhuang)，即在(zai)(zai)使(shi)(shi)用(yong)(yong)過(guo)程中(zhong)(zhong)(zhong)任何錯誤的(de)(de)(de)彎(wan)曲都可(ke)以(yi)通過(guo)熱風槍加(jia)以(yi)矯正，使(shi)(shi)用(yong)(yong)起來更加(jia)自如。f.不(bu)結垢(gou)(gou)。水中(zhong)(zhong)(zhong)碳酸氫鈣及(ji)鎂離子的(de)(de)(de)存在(zai)(zai)易(yi)(yi)(yi)形(xing)成(cheng)沉淀物(wu)(wu)，慢慢使(shi)(shi)管(guan)(guan)(guan)(guan)道堵塞，而PEX管(guan)(guan)(guan)(guan)具有(you)較低的(de)(de)(de)表面(mian)張力(li)以(yi)致(zhi)使(shi)(shi)高表面(mian)張力(li)的(de)(de)(de)水不(bu)會(hui)(hui)被浸潤(run)管(guan)(guan)(guan)(guan)壁，從而防(fang)止管(guan)(guan)(guan)(guan)內水垢(gou)(gou)的(de)(de)(de)形(xing)成(cheng)。g.環保性(xing)(xing)能(neng)(neng)(neng)。PEX管(guan)(guan)(guan)(guan)是無污(wu)染環境(jing)的(de)(de)(de)綠色管(guan)(guan)(guan)(guan)材(cai)，不(bu)含任何毒素，也(ye)不(bu)釋放有(you)害物(wu)(wu)質，焚燒后只產生(sheng)水和(he)(he)二氧(yang)化碳。而UPVC管(guan)(guan)(guan)(guan)在(zai)(zai)生(sheng)產過(guo)程中(zhong)(zhong)(zhong)加(jia)入重(zhong)金(jin)屬(shu)(shu)添(tian)加(jia)劑，同時(shi)本身殘(can)存的(de)(de)(de)單體氯乙烯(xi)在(zai)(zai)使(shi)(shi)用(yong)(yong)時(shi)一起進入輸送(song)的(de)(de)(de)介(jie)質中(zhong)(zhong)(zhong)，易(yi)(yi)(yi)造(zao)成(cheng)介(jie)質污(wu)染；鋁(lv)(lv)塑(su)(su)復(fu)合管(guan)(guan)(guan)(guan)由(you)于(yu)(yu)中(zhong)(zhong)(zhong)間為(wei)(wei)鋁(lv)(lv)層，因鋁(lv)(lv)和(he)(he)塑(su)(su)料的(de)(de)(de)膨脹系數不(bu)一樣，易(yi)(yi)(yi)發(fa)生(sheng)龜裂現象，屬(shu)(shu)不(bu)可(ke)降解物(wu)(wu)質，其(qi)垃圾易(yi)(yi)(yi)造(zao)成(cheng)環境(jing)污(wu)染。
3. PEX管的領域(yu)。
①. 室內(nei)給水(shui)管、熱(re)水(shui)管、純凈水(shui)輸送(song)(song)(song)管。②. 食(shi)品中液體食(shi)品輸送(song)(song)(song)管道(dao)。③. 水(shui)暖(nuan)供熱(re)系(xi)統、中央空(kong)調管道(dao)系(xi)統、地面輻射采暖(nuan)系(xi)統、太(tai)陽能(neng)熱(re)水(shui)器系(xi)統等。④. 電(dian)信、電(dian)氣用配管。⑤. 電(dian)鍍、石油、化(hua)工廠輸送(song)(song)(song)管道(dao)系(xi)統。
4. 交(jiao)聯聚乙烯PEX管的主(zhu)要標準見表(biao)4.3.15。
